Kingdom Protoctista Hogg, 1860 Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844) Class Bacillariophyceae Haeckel (1878) - pennates Subclass Bacillariophycidae D.G.Mann (1990) - raphid diatoms Order Amphorales see Order Thalassiophysales D.G.Mann (1990) 1 Family Amphoraceae see Family Catenulaceae Mereschk. (1902) 2 Family Thalassiophysaceae D.G.Mann (1990)